<template>
  <div>
    <table border="1" width="700" style="border-collapse: collapse">
      <caption>
        购物车
      </caption>
      <thead>
        <tr>
          <th>
            <input type="checkbox" v-model="isAll" />
            <span>全选</span>
          </th>
          <th>名称</th>
          <th>价格</th>
          <th>数量</th>
          <th>总价</th>
          <th>操作</th>
        </tr>
      </thead>
      <GoodTbody
        :goodList="goodList"
        @add="addFn"
        @sub="subFn"
        @del="delFn"
        @change="changeFn"
      ></GoodTbody>
      <tfoot>
        <tr>
          <td>合计:</td>
          <td colspan="5">{{ totalPrice }}</td>
        </tr>
      </tfoot>
    </table>
  </div>
</template>

<script>
import GoodTbody from '@/components/GoodTbody.vue'
export default {
  components: {
    GoodTbody,
  },
  data() {
    return {
      goodList: [
        {
          name: '诸葛亮',
          price: 1000,
          num: 1,
          checked: false,
        },
        {
          name: '蔡文姬',
          price: 1500,
          num: 1,
          checked: false,
        },
        {
          name: '妲己',
          price: 2000,
          num: 1,
          checked: false,
        },
        {
          name: '鲁班',
          price: 2200,
          num: 1,
          checked: false,
        },
      ],
    }
  },
  computed: {
    totalPrice() {
      return this.goodList.reduce((sum, item) => {
        return sum + (item.price * item.num * 1000) / 1000
      }, 0)
    },
    isAll: {
      get() {
        return this.goodList.every((item) => item.checked)
      },
      set(val) {
        // console.log(val)
        this.goodList.forEach((item) => (item.checked = val))
      },
    },
  },
  methods: {
    addFn(index) {
      // console.log('add', index)
      this.goodList[index].num++
    },
    subFn(index) {
      // console.log('sub', index)
      if (this.goodList[index].num > 0) this.goodList[index].num--
    },
    delFn(uname) {
      // console.log(uname)
      this.goodList = this.goodList.filter((item) => item.name !== uname)
    },
    changeFn(index) {
      this.goodList[index].checked = !this.goodList[index].checked
    },
  },
}
</script>

<style></style>
